Cyaniding furnace



March 1, 1932. E. F. DAVIS 1,348,058

CYANIDING FURNACE Filed Oct.. 2, 1929 5 Sheets-Sheet l 1g m W/ J INVENTOR.

Ernest J!" Dal 1L5,

A TTORNEYS Filed Oct. 2, 1929 5 Sheets-Sheet 2 'INVENTOIQ. I meat I Dar 1a,

A TTORNEYS March 1, l932. F. DAVIS CYANIDING FURNACE 3 Sheets-Sheet 3 Filed Oct. 2, 1929 EIZZQI Q Patented Mar. 1, 1932 o TATESI 'PAT NTL E ERNEST F. DAVIS, F ,MUNGIE, INDIANA, AssIonoR ro'wnR vE enAR ooMrAnY, or MUNCIE, INDIANA, A ooRroRA'rIon or INDIANA GYANIDING FURNACE Application. filed October 2, 1929.

My invention relates to improvements in the method of treating ferrous artlcles in a cyanidingbath which is preferably a molten Y 10 supported in suitable bearings 11, hung by bearing supports 12, from a supporting beam bath of cyanide.

It has for one of its objects the method of treating these articles in a manner whereby the articles may be treatedwithout causing wide fluctuations in the temperature of the molten bath as they are passed therethrough and whereby the articles may be rapidly treated and whereby each article istreated in practically the same'manner as the preceding articles in order to maintain a uniformity in the articles to be treated.

For the purpose'of disclosing my invention, I have illustrated certain embodiments thereof in the accompanying drawings, in

which the pot being removed; 7 a

Fig. 2 is a sectional partialview on the line 2-2 of Fig. 1; Y i

Fig. 3 is a transverse sectional view of the furnace, and

Fig. t is a front elevation of the apparatus, partially in section.

In the embodiment illustrated, the furnace comprises the fire chamber 1, which is surrounded by suitable end walls 2 and side'walls '30 3 built up of fire brick. The chamber is provided with burner openings 4: through which may project fuel supplying burners, and'the firing chamber communicates with a suitable chimney 5 by means of a flue 6. Bafiies 7 are of the walls surrounding the chamber. This tank has a greater'length than width and is adapted to contain the molten bath which is maintained at the proper temperature by the burners beneath thegsame.

4 The articles to be treated are deposited at Fig. 1 is a plan view of the furnace-settingbuilt opposite each of the burner openings to v Serial No. 396,614.

one end of the tank 8 and passed to the opposite end of the tank by means of. a suitable conveyor. TlllS conveyor comprlses a screw- 13 above the tank. The screw may be rotated at any desired speed from a controllable source of power in operation. V v V The articles 14 to be heat treated are suspended at one end of the screw, at the right of the drawings in the present instance, from supporting hooks 15, and as the screw is rotated are progressively moved towards the opposite end of the tank. A substantially .continuous feeding of the articles may be I maintained by one operator depositing the articles on the receiving end of the screw'and another operatorremoving them from the delivery end of the screw after they'have passed through the bath.

in pairs with right and left screws feeding toward a common delivery point so that one operator may control the removal of the mal terial from two tanks.

I claim the following: I

1. The method of treating ferrous articles in a molten bath of cyaniding material, which consists in the provision of an elongated pot containing the treating cyaniding material, maintaining the temperature of said bath at a molten and substantially uniform point by heaters located beneath the pot, depositing the ferrous articles to be treated in small quantities at one end of the pot at spaced intervals and progressively moving said small quantities of articles through the bath while maintaining said spaced intervals by means of a constantly moving conveyor mounted above the bath. l j

2. The method of treating ferrous articles in a molten'bath of cyaniding material, which consists in the provision of an elongated pot containing the treating cyaniding material, maintaining the temperature of said bath at In actual practicethe furnaces are built a molten and substantially uniform point by heaters located beneath the pot, depositing the ferrous articles to be treated in small quantities at one end of the pot at spaced in- 5 tervals and progressively moving said small quantities of articles through the bath while maintaining said spaced intervals by means of a constantly moving screw conveyor mounted above the bath and from which the 19 articles are supported in the bath.

In witness whereof, I ERNEST F. DAVIS have hereunto set my hand at Muncie, Indiana, this 27th day of September, A. D. one thousand nine hundred and twenty-nine.

ERNEST F. DAVIS. 

